Steel-concrete construction.



PATENTED AUG. 11, 1903. W. W. GUEST.

INVENTOR STEEL CONCRETE CONSTRUCTION.

APPLICATION FILED JAN. 2, 1903.

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Iatented August 11, 1903 PATENT OFFICE.

WILLIAM \V. GUEST, OF ST. LOUIS, MISSOURI.

STEEL-CONCRETE CONSTRUCTION.

SPECIFICATION forming part of Letters Patent No. 735,759, dated August 11, 1903. Application filed January 2, 1903. Serial'No. 137,537. (No mOdt-EL] To all whom it may concern: 7

Be it known that LVILLIAM W. GUEST, a citizen of the United States, residing at St. Louis, State of Missouri, have invented certain new and useful Improvements in Steel- Concrete Constructions, ofwhich the following is a full, clear, and exact description,

a side view of one of the tension-rods.

reference being had to the accompanying drawings, forming a part hereof.

My invention has relation to improvements in steel-concrete constructions; and it consists in the novel arrangement and disposition of parts, more fully set forth in the specification, and pointed out in the claims.

In the drawings, Figure 1 is a perspectiveof a section of a steel-concrete floor. Fig. 2 is Fig. 3 is a top plan thereof. Fig. 4 is a longitudinal horizontal section on line 4 4 of Fig. 2. Fig. 5 is a vertical longitudinal section on line 5 5 of Fig. 3. Fig. 6 is a transverse section on line 6 6 of Fig. 2. Fig 7 is a transverse section on line 77 of Fig. 2, and Fig. 8 is a perspective showing manner of connectin g the tension-rod to the supporting I-beam;

The present invention has relation to steelconcrete constructions as applied to floors, retaining walls, partition walls, bridges, arches, and the like, and has for its object to effect a union between the concrete and metal portion or rod in a manner insuring, first, the development of the full strength of the concrete and rod at any and all points along the rod second,the development of a more perfect bond between the concrete and the rod; third, the ready adaptability of the fastening of the rods to the structural work of a building by reason of their contour; fourth, the preservation of the tensile strength of the rods, owing to their constant cross-sectional area at all points of their length; fifth, their adaptability for use in any position, owing to the flexibility of the rods, and, sixth, insuring further and other advantages better apparent from a detailed description of the invention, which is as follows:

Referring to the drawings, 1 represents a pair of I-beams spanned by a series of parallel rods 2, the whole embedded in a layer of concrete O, which, as is well known, is composed of variable proportions of Portland-cement,

sand, and broken stones. The rods 2 are in the majority of cases so located relatively in the body of the concrete as to take up the major portion of the tension. strains, the concrete being preferably permitted to resist compression, the various strains being thus equalized according to the fitness of the material entering into the construction. In the case of cantalivers it is apparent that the rods would be made to occupy a plane above the center of gravity of the concrete mass, they being relatively below said center in the case of floor constructions such as shown in the drawings. In order to form a perfect bond between the sections of concrete onopposite sides of the plane of disposition of the rods, the latter are preferably perforated, the rods in the present instance being rolled with horizontal perforati ons 3 for the reception of the material of the concrete, so that when the latter has fully set and hardened a perfect union between the successive sections of concrete is formed. 4 The rod is so rolled that the combined crosssectional areas on each side of the perforation are equal to the cross-sectional area of the bar taken on a plane passing through the imperforate part, as will be better apparent by a more specific reference to the rod itself.

Each rod is formed of a series of imperforate portions 2 of polygonal cross-section (hexagonal in the present case) alternating with a series of perforate portions 2", inclosing the perforations 3 aforesaid, the portions 2 being convex outwardly and having sides which eventually converge to'an edge, said edges determining the form or outline of the perforations. The combined cross-sectional .areas of the portions 2" on each side of a perforation are, equal to the cross-sectional area of the portion 2, the bar being so rolled that notwithstanding the peculiarity of its contour the areas of the cross-sections are constant no matter at what points the planes of section are taken. Thus the sum of the crosscross-sectional. area 2 in Fig. 7. A rod of this nature is flexible, adapting itself to any purpose in steel constructions where occasions arise for the bending thereof around columns, posts, and the like. It is of course to be understood that I do not wish to limit the composite physical configuration of the rod to that shown in the drawings, as that may be departed from without affecting the nature or spirit of my invention, provided, of course, it be so constructed that its cross-sectional areas at all points shall 'be a constant quantity.

The rods are coupled to the I-beam by a clip 4 spanning the beam, the arms of the clip being forked and embracing the rods, as best shown in Fig. 8.

The purpose of preserving a constant crosssectional area in the rod is apparent, it being understood that under such construction the tensile strength at all points is substantially uniform and yet, the rod being perforated, enables the material of the concrete to pass through it and thus serve to connect the mass of concrete on opposite sides of the bar. The whole thus becomes a rigid, compact, and strong construction, possessing all the advantages enumerated therefor above.

Having described my invention, what I claim is- 1. A rod composed of a series of imperforate and perforated portions, and having a constant cross-sectional area throughout the length thereof, substantially as set forth.

2. A rod composed of a series of imperforate and perforated portions, the sum of the cross-sectional areas on each side of the perforated portion being equal to the cross-sectional area of the imperforate portion, substantially as set forth.

3. A rod having a composite outer configuration, and provided with perforations at intervals, and being constant in cross-sectional area throughout its length, substantially as set forth. 4

4. In a steel-concrete construction, a series of rods having a composite outer configuration and provided with perforations for the formation of a bond between them and the concrete, said rods being constant in crosssectional area throughout their length, substantially as set forth.

5. A'rod comprising a series of imperforate and perforated portions, the latter being enlarged beyond the limits of the imperforate portions and being convex outwardly and having sides converging toward the perforations, the imperforate portions being polygonal in cross-section, and having a crosssectional area equal to the sum of the crosssectional areas of the perforated portions on each side of the perforation, substantially as set forth.

In testimony whereof I afiix my signature in presence of two witnesses.

\VILLIAM \V. GUEST. 

